using AutoMapper;
using FastEndpoints;
using MetaCourse.Api.Data;
using MetaCourse.Api.DTOs.Courses;
using MetaCourse.Api.Entities;
using Microsoft.EntityFrameworkCore;

namespace MetaCourse.Api.Endpoints.Courses;

public class CreateCourseEndpoint(AppDbContext db, AutoMapper.IMapper mapper) : Endpoint<CreateCourseDto, GetCourseDto>
{
    public override void Configure()
    {
        Post("api/courses");
        AllowAnonymous();
        Summary(s => s.Summary = "Crée un nouveau cours (statut Brouillon par défaut)");
    }

    public override async Task HandleAsync(CreateCourseDto req, CancellationToken ct)
    {
        var creatorExists = await db.Users.AnyAsync(u => u.Id == req.CreatorId, ct);
        if (!creatorExists)
        {
            AddError(r => r.CreatorId, "L'utilisateur créateur n'existe pas.");
            await SendErrorsAsync(404, ct);
            return;
        }

        var course = mapper.Map<Course>(req);
        db.Courses.Add(course);
        await db.SaveChangesAsync(ct);

        var created = await db.Courses
            .Include(c => c.Creator)
            .Include(c => c.Topics)
            .FirstAsync(c => c.Id == course.Id, ct);

        await SendAsync(mapper.Map<GetCourseDto>(created), 201, ct);
    }
}